/Engine/Source/Developer/TextureFormat/Public/ChildTextureFormat.h
Return the texture tiler for this platform. If present, then the texture build process will try to use the cached linear encoding for the texture as input rather than rebuilding the linear texture prior to tiling. Confusingly, this can not happen if the base texture formate returns true for SupportsTiling, as that refers to the texture encoder, not the format.
virtual const [ITextureTiler](API\Developer\TextureFormat\Interfaces\ITextureTiler) * GetTiler() const